“a 
GREENHOUSE PLANTS. 238 
GRINDELIA. 
the time for putting out the plants 
may be delayed till June ; and pre- 
viously to their removal, the sashes 
of the greenhouse should be left 
open for a week or ten days, night 
and day. Greenhouse plants should 
be watered regularly every evening 
in summer, and twice a day if the 
weather be very hot and dry. In 
winter, they should always be wa- 
tered in a morning, when water is 
given; but this need not be every 
day. Some plants, indeed, do not | 
require watering oftener than once 
a week. The general rule is fre-| 
quently to examine the pots, and to 
give water whenever the earth ap- 
pears to have become dry on the 
surface. Greenhouse plants should | 
never be suffered to stand in saucers 
during winter, as stagnant water is 
peculiarly injurious at that season ; 
and whenever the earth in a pot 
looks black and sodden with water, 
the plant should be turned out of 
the pot, and, after the black earth | 
has been shaken from its roots, it | 
should be repotted in fresh soil, well 
drained with broken crocks or cin- 
ders. In February or March, the 
plants should be looked over, and 
repotted where necessary ;_ those | 
that are too tall should be cut in, 
and cuttings made of their shoots. 
The young plants raised from cut- 
tings made in autumn should be re- 
potted in larger pots for flowering ; 
and where the plants do not require 
fresh potting, but have the surface 
of their mould become green and 
mossy, the moss should be taken off, | 
and the ground slightly stirred with 
a flat stick, taking care, however, 
not to go so deep as to injure the 
roots. When trouble is not an ob- 
ject, all greenhouse plants are the 
better for repotting once every year, 
either in spring or autumn ; and 
when the ball is taken out of the 
pot for this purpose, it should be 
carefully examined, and all the de- 
cayed parts of the roots should be 
‘cut off, Sometimes, when the ball 
of earth is turned out, nearly half 
of it will fall off almost without 
touching it; and when this is the 
| case, it will generally be found that 
there is a worm in the pot. Worms 
do a great deal of mischief to green- 
house plants in cutting through the 
roots, as their instinct teaches them 
| to make their way through the earth 
‘straight across the pot and back 
_again ; and they cannot do this 
without tearing the roots asunder 
|every time they pass. Another 
point to be attended to in the man- 
agement of a greenhouse is keeping 
the plants as near as possible to the 
glass ; as, unless this be done, the 
plants will become what gardeners 
call “drawn up,” and unnaturally 
tall and slender, from the efforts 
they make to reach the light. 
Grevi'LLEA.— Protedcee.— Aus- 
tralian plants with very curious 
flowers, which should be grown in 
a mixture of equal parts of sand, 
loam, and peat. ‘They are increas- 
ed by seeds, which ripen freely, or 
_ by cuttings of the old wood, in sand, 
under a bell-glass. 
GrirFl'nia. — Amarylliddcea. — 
Handsome bulbous-rooted plants, 
which require the heat of a stove, 
and which should be grown in equal 
parts of white sand, loam, and peat. 
They should be allowed a season of 
/complete rest in winter, and abun- 
_dantly supplied with water when 
they begin to grow after repotting 
in spring. They should have plen- 
ty of air; and they are increased 
by offsets, which should be taken 
off when they are repotted. They 
flower in autumn. 
GrinvE‘LiA, W.; (Do'nta, R 
Br.) — Composite.— Perennial and 
annual plants, with large showy 
yellow flowers. The leaves of some 
of the species are covered with a 
white glutinous matter, that sok 
like milk. Nearly all the specie 
iare natives of Mexico, and they 
